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there should be a sender unit with one wire attached that is connected to the oil light or gauge and there possible is a oil pressure sensor switch with 2 or more wires attached that reports to the ECM unit that shuts the motor down when the oil pressure is insufficient
take it to a service center and have it identified

Howdy Steve. Well here are a few things I'd like you to check and do. First thing, did you have your oil changed recently, have you checked your oil level? Then my new friend look at the oil filler cap and look under it. If it looks like a malted shake under it you have a problem. Probably a blown head gasket. If this is or was the case your over temp light would have turned on. Have you had regular service done on your vehicle? Oil changes primarily. You could just have a bad oil sending unit. This would be the easiest fix. If your a little technical go to UTUBE and go into search location and removal of oil sending unit for your car. Remove positive cable on battery and disconnect and reconnect sensor connector. Reattach battery cable and restart car. Hopefully this will correct your problem. Let me know. Jim

First thing you want to do is not drive or run your engine for more than a few seconds to test until you get this fixed.

First step is to check your oil level. If the oil drops to low so will the oil pressure and set this light off.

If your oil level is fine then the usual cause is the oil pressure sending unit. First inspect the wiring and the connector to the oil pressure sending unit. Now to test this you have to put an oil pressure gauge in the place of the sending unit and turn the car on for a couple minutes and see if the pressure comes up. If the pressure comes up then the sensor is more than likely bad replace it. The oil sending unit is easy to remove. Pull the connector and stick a deep socket on the end and twist out.

If you do have oil pressure then your getting into some heavy work. Oil pump, worn engine bearing to name a couple things. At this point you should have some better than average skills and an assortment of tools.

you are on the right track, the first thing would be the sending unit, thats the most common reason for this type of problem,the oil sending unit is located on the top rear of the engine , heres a diagram picture to help you this is of a 6.6 engine as there are 5 engines that come in the truck but all have the oil sensor in the same location, have a good day and hope this helps.

Oil Filter, oil pressure sensor, front crankshaft seal, oil pan gasket there are a lot of things that could leak oil. depends on how fast it is coming out, Ive seen a lot of oil pan gaskets oil pressure sensors and even some oil filters not snugged up.